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   https://doi.org/10.1039/c8ta07901c  

   Rapti, Sofia; Diamantis, Stavros A.; Dafnomili, Argyro; Pournara, Anastasia; Skliri, Euaggelia; Armatas, Gerasimos S.; Tsipis, Athanassios C.; Spanopoulos, Ioannis; Malliakas, Christos D.; Kanatzidis, Mercouri G.; et al (October 2018, Journal of Materials Chemistry A)

   The sorption properties of [Zr 6 O 4 (OH) 4 (NH 3 + -BDC) 6 ]Cl 6 · x H 2 O ( MOR-1 ) and H 16 [Zr 6 O 16 (H 2 PATP) 4 ]Cl 8 · x H 2 O ( MOR-2 ) towards ReO 4 − and TcO 4 − were studied in detail. Both MOR-1 and MOR-2 are very effective sorbents for ReO 4 − and TcO 4 − anions, with MOR-2 showing the highest sorption capacity (up to 4.1 ± 0.4 mmol g −1 ) among the known metal organic materials. Importantly, the exceptional sorption capacity of MOR-2 is retained even under conditions simulating acidic nuclear waste. In addition, MOR-1 and MOR-2 exhibit selective luminescence ReO 4 − sensing properties, demonstrated for the first time for MOF materials. 

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4. Experimental and theoretical evidence of attractive interactions between dianions: [PdCl ₄ ] ²⁻ ⋯[PdCl ₄ ] ²⁻

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   Zierkiewicz, Wiktor; Michalczyk, Mariusz; Maris, Thierry; Wysokiński, Rafał; Scheiner, Steve (December 2021, Chemical Communications)

   Inspection of the arrangement of tetrachloridopalladate( ii ) centers in a crystalline solid places the Cl of one [PdCl 4 ] 2− directly above the Pd center of its neighbor. A survey of the CSD provides 22 more examples of such MX 4 2− ⋯MX 4 2− complexes, with M being a Group 10 metal and X = Cl, Br, or I. Quantum calculations attribute this arrangement to a π-hole bond wherein Cl lone pairs of one unit transfer charge to vacant orbitals above the Pd center of its neighbor. The stabilizing effect of this bond must overcome the strong Coulombic repulsion between the two dianions, which is facilitated by a polarizable environment as would be present in a crystal, but much more so when the effects of the neighboring counterions are factored in. These conclusions are extended to other [MX 4 ] 2− homodimers, where M represents other members of Group 10, namely Ni and Pt. 

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